Woah, i think that is a Yume Nikki reference on page seven, upper left panel. The abstract Tanaka rubbing a handrail is totally a nod to KyuuKyuu-kun from Yume Nikki https://yumenikki.fandom.com/wiki/KyuuKyuu-kun
Yay! I wondered if someone would put this back up. I love Inugami's work, this is a fun little series, too bad the translation has been stalled all these years.